Compaq t1000 - Terminal Thin Client PC Manual page 13

When running the IBM 3270 emulation, the setting of this option determines whether or
not support of TN3270E is suppressed. When selected, additional options are available by
clicking the TN3270 Options button. These are described in the TN3270 Options section.
When running the IBM 5250 emulation, the setting of this option determines whether or
not support of TN5250E is suppressed. When selected, additional options are available by
clicking the TN5250 Options button. These are described in the TN5250 Options section.
These settings determine whether or not the Telnet Binary or EOR options are supported.
Both are set to no by default.
No Does not force any negotiations. It leaves it up to the host to decide what to
do.
DO Forces negotiation. The host is informed that the option is supported.
DONT Force negotiation. A negotiation packet is sent to the host telling it that the
option is not supported.
The setting of these options determine whether or not a timing mark (TM) and/or carriage
return (CR) is sent with a Telnet break packet. A timing mark is sent by default.